JP2009059579A - Electrical parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electrical parts in which reliability is improved by having a structure in which flux is hard to reach a terminal material exposed on the outer bottom face of a housing. <P>SOLUTION: In a push switch device 1 in which an opening part 8b to expose the terminal material 20 is formed on the outer bottom face of the housing 10, on the outer bottom face of the housing 10, a plurality of mounting parts 8c to separate the opening part 8b from a printed board 30 are protruded and installed, and a groove part 8d for flux staying is notched and installed between these mounting parts 8c and the opening part 8b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrical component that is mounted by deriving an external terminal from a terminal material that is partially exposed on the outer bottom surface of a housing, and soldering the external terminal to a printed circuit board. The present invention relates to a flux rising prevention structure for preventing flux from entering undesired locations.

  For example, in an electrical part such as a switch device, a part of a flat terminal material embedded in the bottom of the housing by insert molding technology is exposed as a fixed contact on the inner bottom surface of the housing, and the end of the terminal material is exposed to the housing. It is widely known that an external terminal protrudes outwardly from the side surface, and this type of electrical component is mounted by soldering the external terminal to a printed circuit board.

Moreover, in this type of electrical component, the exposed portion of the terminal material disposed on the inner bottom surface of the housing may be displaced due to resin pressure during insert molding. May be pressed against the exposed portion of the terminal material to prevent displacement. Also, if the bottom of the housing is thin, the flow of molten resin may deteriorate between the exposed portion of the terminal material and the outer bottom surface of the housing during insert molding. The exposed part of the terminal material may be pushed up from below by a pin. Then, when insert molding is performed with the exposed portion of the terminal material pushed up with the presser pin from below, an opening that exposes a part of the back surface of the terminal material is formed on the outer bottom surface of the molded housing. (See, for example, Patent Document 1).
JP 2003-123573 A (

  By the way, in the electrical component in which the opening for exposing a part of the back surface of the terminal material is formed on the outer bottom surface of the housing as described above, the flux is contained in the opening in the soldering process for mounting this on the printed circuit board. Therefore, it is necessary to take measures to effectively prevent flux increase from the viewpoint of increasing the reliability of electrical components.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide an electrical component that has a structure in which the flux does not easily reach the terminal material exposed on the outer bottom surface of the housing and has improved reliability. There is to do.

  In order to achieve the above object, according to the present invention, a part of the flat plate-like terminal material embedded in the bottom of the housing is exposed on the inner bottom surface of the housing, and the back surface of the exposed portion of the terminal material is A part is exposed at the opening of the outer bottom surface of the housing, and the end of the terminal material protrudes outward from the side surface of the housing to form an external terminal, and the external terminal is soldered to the printed circuit board. In the electrical component to be mounted, a plurality of mounting portions that are mounted on the printed board and separate the opening from the printed board are provided on the outer bottom surface of the housing. And a groove is formed between the opening and the opening.

  Since the electrical component having a plurality of mounting portions projecting from the outer bottom surface of the housing is mounted on the printed board through the mounting portions, the flux is loaded from the printed board side in the soldering process. The outer bottom surface of the housing cannot be reached without climbing up the mounting portion. Moreover, since a groove is engraved between the opening that exposes the terminal material on the outer bottom surface of the housing and the mounting portion, the flux that has reached the outer bottom surface of the housing does not further cross the groove. The terminal material in the opening cannot be reached. Therefore, this electric component has a very low possibility that the flux will reach the terminal material in the opening, and therefore it is possible to effectively prevent a reduction in reliability due to the penetration of the flux.

  In the above configuration, the positioning protrusion is provided on the bottom surface of at least a part of the plurality of mounting portions, and the housing is printed by inserting the positioning protrusion into the hole of the printed circuit board. If the positioning is performed on the board, the positional accuracy of the housing on the printed board can be easily improved. In this case, in the dip soldering process, there is a high possibility that the flux will climb up the hole of the printed circuit board and reach the mounting portion of the housing, but the flux will climb up the mounting portion and reach the outer bottom surface of the housing. However, since there is a groove in front of the opening, the possibility that the flux reaches the opening is low.

  Further, in the above configuration, the plurality of mounting portions are arranged in a distributed manner on the peripheral edge portion of the outer bottom surface of the housing, and the groove portions are protruded from the side surfaces of the housing at positions adjacent to the mounting portions. And the area where the mounting portion exists on the outer bottom surface of the housing is separated from the remaining area by the corresponding groove portion, and the housing is placed on the printed circuit board in a stable posture by the plurality of mounting portions. In addition, the flux that has entered the groove can be quickly discharged outward. In this case, it is preferable that the mounting portion and the groove portion disposed adjacent to each other are rising surfaces in which the outer wall surface on the groove portion side of the mounting portion and the inner wall surface of the groove portion are continuous. As a result, the flux cannot effectively reach the opening unless the rising surface that continuously extends from the tip of the mounting portion to the back of the groove portion is crawled up in the soldering process. It is easy to reduce the thickness.

  In addition, in the configuration in which both ends of the groove portion are exposed to the side surface of the housing, when the groove portion is formed in an arc shape in plan view, the flux that scoops up the mounting portion and enters the groove portion toward the both ends of the groove portion. Since it becomes easy to flow, the flux in the groove is smoothly discharged to the outside of the housing, and thus the possibility that the flux overflows from the groove is reduced. Therefore, it becomes more difficult for the flux to reach the opening where the terminal material is exposed on the outer bottom surface of the housing.

  Further, in the above configuration, if the cross-sectional shape of the groove portion is a constricted shape in which the mounting portion side rises linearly and the opening portion side is curved in a bulging shape, the flux that has entered the groove portion is angular. Therefore, it is preferable that the flux hardly overflows from the inside of the groove portion to the opening portion side.

  According to the electrical component of the present invention, since it is mounted on the printed circuit board via a plurality of mounting parts protruding from the outer bottom surface of the housing, the flux scoops up the mounting part from the printed circuit board side in the soldering process. Otherwise, it will not be possible to reach the outer bottom surface of the housing, and a groove is engraved between the mounting portion and the opening exposed on the outer bottom surface of the housing. The flux that has reached the bottom cannot reach the terminal material in the opening unless it further crosses the groove. Therefore, this electric component has a very low possibility that the flux will reach the terminal material in the opening, and therefore it is possible to effectively prevent a reduction in reliability due to the penetration of the flux.

  FIG. 1 is a front view of a push switch device according to an embodiment of the present invention, FIG. 2 is a perspective view of the push switch device as viewed obliquely from above, and FIG. Fig. 4 is a perspective view of the push switch device as viewed obliquely from below, Fig. 4 is a cross-sectional view taken along the line A-A in Fig. 3, Fig. 5 is an enlarged view of the main part of Fig. 4, and Fig. 6 is a line BB in Fig. 3. FIG. 7 is a sectional view showing the return state of the push switch device, FIG. 8 is a sectional view showing the full stroke state of the push switch device, and FIG. 9 is a sectional view showing the push lock state of the push switch device. 10 is an exploded perspective view of the push switch device, FIG. 11 is a plan view of a case provided in the push switch device, FIG. 12 is a cross-sectional view taken along the line CC of FIG. 11, and FIG. The bottom view and FIG. FIG. 15 is a front view of an operating body provided in the push switch device, FIG. 16 is a plan view of the operating body, and FIG. 17 is a bottom view of the operating body. 18 is an explanatory view showing the developed first ratchet teeth formed on the operating body, FIG. 19 is a front view of a cam follower provided in the push switch device, FIG. 20 is a plan view of the cam follower, and FIG. 22 is a bottom view of the cam follower, FIG. 22 is an explanatory view showing the second ratchet teeth formed on the cam follower, FIG. 23 is a plan view of a movable contact provided in the push switch device, and FIG. 24 is the push switch. FIG. 25 is a plan view of the wafer, FIG. 26 is a bottom view of the wafer, and FIG. 27 is a first and second lattice corresponding to a series of operations of the push switch device. It is an explanatory view showing a positional change of Tsu preparative teeth and the cam portion.

  As shown in FIGS. 1 to 10, a push switch device 1 according to this embodiment includes a case 2 having a hollow structure inside, an operating body 3 that can be moved up and down in the axial direction (vertical direction), and an operating body 3. The cam follower 4 that can be moved up and down in the axial direction and rotated in the circumferential direction in accordance with the lifting and lowering operation of the cam, the first coil spring 5 that is an elastic member interposed between the operating body 3 and the cam follower 4, and the cam follower 4 And an actuating member 6 that is spline coupled to the cam follower 4 and a second coil spring 7 that is a return spring interposed between the cam follower 4 and the actuating member 6 and rotatably supports the actuating member 6. And a mounting plate 9 that is attached so as to hold the case 2 and the wafer 8. A housing 10 is constituted by the case 2 and the wafer 8. There.

  Case 2 is formed of a synthetic resin material such as PBT (polybutylene terephthalate). As shown in FIGS. 10 to 14, the case 2 has a cylindrical internal space below the circular upper opening end 2 a, and a guide portion 11 is formed on the peripheral wall of the internal space. A recessed step portion 2b and a jetty portion 2c for being fitted to the upper portion of the wafer 8 are formed in the lower portion of the wafer. The guide portion 11 is adjacent to a groove-shaped rotation restricting portion 11a extending in the axial direction, a tapered groove-shaped introducing portion 11b communicating with one side of the lower portion of the rotation restricting portion 11a, and a tapered one side of the introducing portion 11b. The four taper groove-shaped return restriction portions 11c are formed, and the rotation restriction portion 11a, the introduction portion 11b, and the return restriction portion 11c are connected to each other within an angle range of 90 degrees along the circumferential direction. ing. The guide portion 11 is for guiding or regulating movement in a predetermined direction by engaging a part of the operating body 3 or a part of the cam follower 4. A rectangular parallelepiped housing configured by fitting the lower part of the case 2 and the upper part of the wafer 8 is the housing 10, and the case 2 and the wafer 8 are attached to the housing 10 by attaching a mounting plate 9 made of a metal plate. Are securely integrated. That is, the mounting plate 9 having a large-diameter circular hole 9a that exposes the upper opening end 2a is externally mounted on the case 2, and the notches 9b formed at four positions on the lower end side of the mounting plate 9 are respectively formed on the wafer 8. The case 2 is prevented from falling off the wafer 8 by being snap-fitted to the engaging protrusions 18 at the corners of the outer wall.

  The operation body 3 is formed of an elastomer or the like. As shown in FIG. 10 and FIGS. 15 to 18, the operating body 3 includes an operating shaft 3 a that protrudes upward, a penetrating shaft 3 b that protrudes downward from the operating shaft 3 a, and a large portion that is continuous with the lower end of the operating shaft 3 a. It has a cylindrical portion 3c that surrounds the through-shaft 3b at the diameter portion, and four pieces of guided leg portions 3d that protrude outward in an L shape from the peripheral edge at the lower end of the cylindrical portion 3c. First ratchet teeth 12 are formed along the circumferential direction on the lower end surface of the portion 3c. The first ratchet teeth 12 have four crests 12a and four troughs 12b that are alternately continuous in the circumferential direction. Since each guided leg 3d is inserted into the groove-shaped rotation restricting portion 11a on the inner surface of the case 2, the operating body 3 is guided in the axial movement, but is rotated in the circumferential direction. Operation is restricted. A cylindrical internal space is defined between the cylindrical portion 3c and the through shaft 3b, and the first coil spring 5 and the cam follower 4 are incorporated into the internal space, and the shaft hole 4a of the cam follower 4 is assembled. The penetration shaft 3b is loosely inserted. However, a retaining portion 13 that is an annular member such as a washer is attached to the tip of the penetrating shaft 3b. Since the retaining portion 13 is larger in diameter than the shaft hole 4a, the tip of the penetrating shaft 3b is It does not move upward through the shaft hole 4a.

  The cam follower 4 is formed of a synthetic resin material having excellent slidability. As shown in FIG. 10 and FIGS. 19 to 22, the cam follower 4 includes a cylindrical inner cylinder portion 4 b erected from the peripheral edge portion of the shaft hole 4 a formed in the rotation center portion, and an upper end of the inner cylinder portion 4 b. It has an outer cylinder part 4c that continuously surrounds the inner cylinder part 4b, and an annular collar part 4d that is continuous with the lower end of the outer cylinder part 4c, and a second ratchet on the upper surface of the collar part 4d. Teeth 14 are formed. In addition, cam portions 15 having an inclined upper surface are projected at four equally spaced locations on the outer peripheral surface of the flange portion 4d, and are cut at two locations facing the inner peripheral portion of the flange portion 4d. A notch-like engagement groove 16 is provided. The inner cylindrical portion 4b and the outer cylindrical portion 4c of the cam follower 4 are incorporated in the cylindrical portion 3c of the operating body 3, and the through-shaft 3b is loosely inserted into the shaft hole 4a, and between the inner cylindrical portion 4b and the through-shaft 3b. Both ends of the arranged first coil spring 5 are in elastic contact with the peripheral edge of the shaft hole 4a and the ceiling surface of the cylindrical portion 3c. Further, since the upper surface of the flange portion 4d faces the lower end surface of the cylindrical portion 3c, the second ratchet teeth 14 are engaged with the first ratchet teeth 12, and the cam portion 15 is connected to the guide portion 11 on the inner surface of the case 2. It arrange | positions in the position which can be engaged. And when the cam part 15 is located in the rotation control part 11a, although the cam follower 4 is guided to the raising / lowering operation to an axial direction, the rotation operation to the circumference direction is controlled. Further, when the cam portion 15 is locked to the return restricting portion 11c, the cam follower 4 is restricted from moving up and rotating. Like the first ratchet teeth 12, the second ratchet teeth 14 have four crests 14a and four troughs 14b that are alternately continuous in the circumferential direction, but the top of each crest 12a. Is serrated, while the top of each peak 14a is rounded. Since the cam follower 4 is always elastically urged upward by the second coil spring 7 disposed between the inner cylinder portion 4b and the outer cylinder portion 4c, the second ratchet teeth 14 are the first ratchet teeth. 12 is adapted to be brought into meshing engagement. Further, when the operating body 3 is pushed against the elastic force of the second coil spring 7, the cam follower 4 is also lowered integrally. However, when the operating body 3 is pushed, the first ratchet teeth 12 are crested. Since the portion 12a is set to push the inclined surface of the peak portion 14a of the second ratchet tooth 14, when the cam portion 15 is detached from the rotation restricting portion 11a and the return restricting portion 11c by the push operation of the operating body 3, The cam follower 4 is configured to rotate by a predetermined angle in the circumferential direction. In addition, the engaging groove 16 of the inner peripheral part of the collar part 4d is for connecting the action | operation member 6 by spline.

  The actuating member 6 is formed of a synthetic resin material having excellent slidability. As shown in FIGS. 7 and 10, the operating member 6 includes a flat plate portion 6 a that is disposed to face the inner bottom surface of the wafer 8, and a pair of upright pieces 6 b that are provided on the flat plate portion 6 a and face each other. And an annular jetty 6c protruding from the back surface of the flat plate portion 6a, and a slightly wide latching portion 6d is formed at the tip of each upright piece 6b. Each upright piece 6b is inserted into each engagement groove 16 of the flange 4d, and the cam follower 4 is not hindered from moving up and down, but the rotational force of the cam follower 4 is transmitted through the flange 4d. The actuating member 6 is splined to the cam follower 4 and can rotate integrally. Moreover, the movable contact 17 is attached to the back surface side of the flat plate portion 6a of the operating member 6 around the annular jetty 6c by means of heat or the like. As shown in FIGS. 10 and 23, the movable contact 17 is formed in a substantially annular shape, and a contact portion 17a is formed at a position opposed to the movable contact 17 by 180 degrees. A second coil spring 7 is incorporated in the radially inner space of each upright piece 6 b of the actuating member 6, and both ends of the second coil spring 7 are elastic on the upper surface of the flat plate portion 6 a and the ceiling surface of the cam follower 4. It comes to touch. The spring load of the second coil spring 7 is sufficiently larger than the spring load of the first coil spring 5. Further, the latching portion 6d formed at the tip of each standing piece 6b is for latching near the engagement groove 16 of the cam follower 4 against the elastic force of the second coil spring 7 during assembly. However, when the assembly is completed by attaching the case 2, the wafer 8 and the mounting plate 9 thereafter, the second coil spring 7 is set in a more compressed state, so that the latching portion 6d is separated from the cam follower 4. Kept in a detached position.

  The wafer 8 is formed of a synthetic resin material such as PBT, and a fixed contact 21 and an external terminal 22 are integrated by inserting a flat terminal material 20 into the molding die. At the center of the inner bottom surface of the wafer 8, an annular guide wall 8a that is inserted into the annular jetty 6c of the operating member 6 and supports the flat plate portion 6a is projected, and the outer peripheral surface of this guide wall 8a is Since it is slidably contacted with the inner peripheral surface of the annular jetty 6c, the rotation of the actuating member 6 is guided by the guide wall 8a and smoothly performed. The terminal material 20 is made of a highly conductive metal plate, part of which is exposed as a fixed contact 21 at a plurality of locations on the inner bottom surface of the wafer 8, and the end of the terminal material 20 is a plurality of locations on the side surface of the wafer 8. Projecting outward as an external terminal 22. On the outer bottom surface of the wafer 8, a plurality of openings 8 b are formed through which a part of the back surface of each fixed contact 21 is exposed. These openings 8b are traces of presser pins (not shown) inserted into the mold and pressed against the fixed contacts 21 so that the terminal material 20 is not displaced by resin pressure during insert molding. is there. In addition, the four corners (corner corner regions) of the outer bottom surface of the wafer 8 are thick mounting portions 8c, and a groove 8d having an arcuate shape in plan view is formed between each mounting portion 8c and the opening 8b. Has been. In addition, columnar positioning protrusions 8e and 8f having different thicknesses protrude from the bottom surfaces of the two placement portions 8c having a diagonal positional relationship.

  As shown in FIG. 1, the push switch device 1 according to the present embodiment has each mounting portion 8 c mounted at a predetermined position on the printed board 30, and each external terminal 22 is connected to a corresponding land portion of the printed board 30. Surface mounting is performed by soldering (not shown). Since these mounting portions 8c are projected at the four corners of the outer bottom surface of the wafer 8, the push switch 1 can be mounted on the printed circuit board 30 in a stable posture, and the positioning protrusions 8e and 8f are mounted on the printed circuit board 30 at the time of mounting. Therefore, the push switch device 1 can be easily and accurately positioned with respect to the printed circuit board 30. Further, as shown in FIGS. 3 and 26, each mounting portion 8c is surrounded by two edges that are continuous on the outer bottom surface of the wafer 8, and groove portions 8d that are located at both ends of the two edges. Yes. In other words, the mounting portion 8c formed in the corner area of the outer bottom surface of the wafer 8 is separated from the remaining region by the groove portion 8d adjacent to the mounting portion 8c and projecting both ends to the side surface of the wafer 8. Therefore, even if the flux that has entered between the mounting portion 8c and the printed circuit board 30 scoops up the mounting portion 8c in the soldering process, the flux toward the opening 8b has to cross the groove portion 8d. It is impossible to reach the opening 8b. Even if the flux enters the groove 8d, both ends of the groove 8d are exposed to the side surface of the wafer 8, so that the flux is easily discharged to the outside. Therefore, the flux crosses the groove 8d and opens. The possibility of adhering to the terminal material 20 in 8b is low. Further, since the outer wall surface on the groove portion 8d side of the mounting portion 8c is continuously formed with the inner wall surface of the groove portion 8d, a rising surface 8g (see FIG. 5) having a large height is formed, so that the flux is placed on the mounting portion. The opening 8b cannot be reached unless the rising surface 8g continuously extending from the tip of 8c to the back of the groove 8d is scooped up. Furthermore, as shown in FIG. 5, the cross-sectional shape of the groove 8d is a constricted shape in which the adjacent mounting portion 8c side rises linearly and the opening 8b side curves in a bulging shape. Even if the flux overflows from the groove 8d, it is difficult to flow toward the opening 8b.

  Next, the operation of the push switch device 1 configured as described above will be described with reference to FIGS. 7 to 9 and FIG. In FIG. 27, only one cam portion 15 of the cam follower 4 is shown, but the other cam portions 15 operate in the same manner.

  FIG. 7 shows an initial state (return state) in which the operation shaft 3a of the operation body 3 is not pushed. In this initial state, the operating body 3 is held at the non-operating position by the resilient force of the first and second coil springs 5 and 7. Further, the cam follower 4 is biased upward by the elastic force of the second coil spring 7, and the guided leg portion 3 d of the operating body 3 and the cam portion 15 of the cam follower 4 are both guide portions 11 on the inner surface of the case 2. The rotation restricting portion 11a is engaged. Therefore, the operation body 3 and the cam follower 4 are restricted from rotating in the circumferential direction by the rotation restricting portion 11a. At this time, as shown in FIG. 27A, the first ratchet tooth 12 of the operating body 3 is engaged with the inclined surface of the second ratchet tooth 14 of the cam follower 4 at an unstable position. In this initial state, the first coil spring 5 is in elastic contact with the ceiling surface of the cylindrical portion 3 c, so that the operating body 3 does not rattle the cam follower 4. However, since the spring load of the first coil spring 5 is sufficiently smaller than the spring load of the second coil spring 7, the operation of the second coil spring 7 as a return spring is caused by the first coil spring 5. There is no inhibition.

  When the operating body 3 is in the non-operating position shown in FIG. 7, if the operating shaft 3a is pushed directly or via an actuator (not shown), the peak of the first ratchet teeth 12 is shown in FIG. Since the portion 12a pushes the peak portion 14a of the second ratchet tooth 14 and the cam portion 15 is detached from the rotation restricting portion 11a, the elastic force of the second coil spring 7 as shown in FIG. The crest portion 14a of the second ratchet tooth 14 moves to a stable position where it engages with the valley portion 12b of the first ratchet tooth 12, and the cam follower 4 rotates by this amount of movement. Therefore, the operation member 6 rotates integrally with the cam follower 4, and the first contact switching operation (for example, switch-on operation) is performed by changing the contact position of the movable contact 17 with respect to the fixed contact 21. FIG. 27 (c) shows a full stroke state. When the operation force is removed after the push operation on the operation body 3, the cam portion 15 of the cam follower 4 pushed up by the elastic force of the second coil spring 7 is returned to the position shown in FIG. Since the cam follower 4 rotates in contact with the inclined surface of the portion 11c and the cam portion 15 slides along the inclined surface, as shown in FIG. 27E, the cam portion 15 is engaged with the return regulating portion 11c. It will be stopped. That is, since the cam follower 4 is restricted in upward movement and rotation and is held in the height position shown in FIG. 9 in the case 2, even if the first coil spring 5 pushes up the operating body 3, the retaining portion 13 does not move. The return operation of the operating body 3 is restricted by coming into contact with the peripheral edge of the shaft hole 4a, whereby the operating body 3 is held at a position where the amount of protrusion from the case 2 is small and is in a push-lock state. Even in such a push-lock state, the first coil spring 5 is in elastic contact with the ceiling surface of the cylindrical portion 3 c, so that the operating body 3 does not rattle the cam follower 4.

  In the push lock state shown in FIG. 9, when the operation shaft 3a of the operation body 3 is pushed directly or via an actuator (not shown), as shown in FIG. 27 (f), the peak portion 12a of the first ratchet tooth 12 is obtained. Pushes the peak portion 14a of the second ratchet tooth 14 and the cam portion 15 disengages from the return restricting portion 11c, so that the second force is generated by the elastic force of the second coil spring 7 as shown in FIG. The peak portion 14a of the ratchet tooth 14 moves to a stable position where it engages with the valley portion 12b of the first ratchet tooth 12, and the cam follower 4 rotates by this amount of movement. Therefore, the operation member 6 rotates integrally with the cam follower 4 to perform a second contact switching operation (for example, a switch-off operation) by changing the contact position of the movable contact 17 with respect to the fixed contact 21. FIG. 27 (g) shows a full stroke state. When the operation force is removed after the push operation on the operation body 3 in the push-lock state, the cam portion 15 of the cam follower 4 pushed up by the elastic force of the second coil spring 7 is as shown in FIG. Since the cam follower 4 rotates in contact with the inclined surface of the introduction portion 11b and the cam portion 15 slides along the inclined surface, as shown in FIG. 27 (i), the cam portion 15 is rotated by the rotation restricting portion 11a. As shown in FIG. 27 (j), the cam follower 4 moves up to the height position shown in FIG. 7 as the cam portion 15 rises in the rotation restricting portion 11a. Therefore, the operating body 3 is pushed back to the non-operating position and returns to the initial state.

  As described above, in the electrical component (push switch device 1) according to the present embodiment, the opening 8b through which the terminal material 20 is exposed is formed on the outer bottom surface of the wafer 8, which is the bottom plate member of the housing 10. On the outer bottom surface of the wafer 8, mounting portions 8c are projected at four corners (corner corner regions), and groove portions 8d adjacent to the mounting portions 8c are formed in the vicinity of the four corners. Since the portion 8c is partitioned from the remaining region by the adjacent groove 8d, there is almost no possibility that the flux reaches the opening 8b when the push switch device 1 is mounted on the printed circuit board 30 and soldered. That is, in such a soldering process, the flux does not reach the opening portion 8b unless it climbs up the placement portion 8c from the printed board 30 side and crosses the groove portion 8d, but continues from the tip of the placement portion 8c to the back of the groove portion 8d. Thus, the amount of flux that crawls up the rising surface 8g having a large height (see FIG. 5) is not so large, and both ends of the groove 8d face the side surface of the wafer 8 even if the flux enters the groove 8d. The flux is easily discharged to the outside of the wafer 8. Therefore, the possibility that the flux crosses the groove portion 8d and adheres to the terminal material 20 in the opening portion 8b is extremely low, and it is possible to effectively prevent a decrease in reliability due to the penetration of the flux.

  Even if the mounting portion 8c and the corresponding groove portion 8d are slightly separated from each other, there is an effect of preventing the flux from rising. However, as in this embodiment, the outer wall surface of the mounting portion 8c and the inner wall surface of the groove portion 8d are effective. If the rising surface 8g that is continuous is formed, the protruding height of the mounting portion 8c can be suppressed, so that the housing 10 can be easily thinned. Further, when the groove portion 8d is formed in an arc shape in plan view as in the present embodiment example, the flux that climbs up the placement portion 8c and enters the groove portion 8d is likely to flow toward both ends of the groove portion 8d. Thus, the flux in the groove 8d can be discharged smoothly to the outside of the wafer 8, and the possibility of the flux overflowing from the groove 8d is reduced. Further, as in the present embodiment example, if the cross-sectional shape of the groove portion 8d is a constricted shape in which the adjacent mounting portion 8c side rises linearly and the opening portion 8b side curves in a bulging shape, the flux is Even when it overflows from the groove 8d, it becomes difficult to flow to the opening 8b side, so the possibility that the flux adheres to the terminal material 20 in the opening 8b is further reduced.

  Further, if the positioning projections 8e and 8f are provided on the bottom surface of a part of the mounting portion 8c as in this embodiment, the positioning projections 8e and 8f are inserted into the positioning holes 31 and 32 of the printed circuit board 30, respectively. By inserting, the housing 10 can be mounted on the printed circuit board 30 easily and with high accuracy. However, when this type of electrical component is mounted on the printed circuit board 30 by dip soldering, there is a high possibility that the flux creeps up the positioning holes 31 and 32 and reaches the mounting portion 8c of the housing 10. Even in such a case, the flux cannot reach the opening 8b unless it climbs up the mounting portion 8c and crosses the groove 8d, so that the possibility that the flux adheres to the terminal material 20 in the opening 8b is reduced.

  In this type of electrical component, the outer bottom surface of the housing 10 is separated from the printed circuit board 30 by each mounting portion 8c. However, as in the present embodiment, the four mounting portions 8c are arranged outside the housing 10. If the housing 10 is disposed in a balanced manner on the peripheral edge of the bottom surface, the housing 10 can be mounted on the printed circuit board 30 in a stable posture, and the flux that has entered the groove 8d can be quickly discharged outward.

  In the above embodiment, the push switch device has been described as an example of the electrical component. However, in other electrical components in which the opening for exposing the terminal material is formed on the outer bottom surface of the housing, Needless to say, the flux rise can be effectively prevented by providing the mounting portion and the groove on the bottom surface. In the above embodiment, both ends of the groove are exposed to the side surface of the housing in order to make it difficult for the flux to collect in the groove, but when the amount of flux entering the groove is small, one end of the groove Or both ends may be closed ends.

It is a front view of the push switch device concerning the example of an embodiment of the present invention. It is the perspective view which looked at this push switch device from diagonally upward. It is the perspective view which looked at this push switch device from the slanting lower part. It is sectional drawing which follows the AA line of FIG. It is a principal part enlarged view of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which shows the reset state of this push switch apparatus. It is sectional drawing which shows the full stroke state of this push switch apparatus. It is sectional drawing which shows the push lock state of this push switch apparatus. It is a disassembled perspective view of this push switch apparatus. It is a top view of the case with which this push switch device is provided. It is sectional drawing which follows the CC line of FIG. It is a bottom view of the case. It is explanatory drawing which expand | deploys and shows the guide part formed in this case. It is a front view of the operation body with which this push switch device is provided. It is a top view of this operation body. It is a bottom view of the operation body. It is explanatory drawing which expand | deploys and shows the 1st ratchet tooth formed in this operation body. It is a front view of a cam follower provided in the push switch device. It is a top view of this cam follower. It is a bottom view of this cam follower. It is explanatory drawing which expand | deploys and shows the 2nd ratchet tooth formed in this cam follower. It is a top view of the movable contact with which this push switch device is equipped. It is a front view of the wafer with which this push switch device is provided. It is a top view of this wafer. It is a bottom view of the wafer. It is explanatory drawing which shows the position change of the 1st and 2nd ratchet tooth | gear corresponding to a series of operation | movement of this push switch apparatus, or a cam part.

Explanation of symbols

1 Push switch device (electrical parts)
2 Case 3 Operating body 4 Cam follower 6 Actuating member 8 Wafer 8b Opening portion 8c Placement portion 8d Groove portion 8e, 8f Positioning projection 8g Standing surface 9 Mounting plate 10 Housing 17 Movable contact 20 Terminal material 21 Fixed contact 22 External terminal 30 Printed circuit board 31, 32 Positioning hole

Claims (6)

A portion of the flat terminal material embedded in the bottom of the housing is exposed on the inner bottom surface of the housing, and a part of the back surface of the exposed portion of the terminal material is an opening on the outer bottom surface of the housing. It is an electrical component that is exposed and formed by projecting the end of the terminal material outward from the side surface of the housing to form an external terminal, and soldering the external terminal to a printed circuit board,
On the outer bottom surface of the housing, a plurality of mounting portions that are mounted on the printed board and separate the opening from the printed board are projected, and a groove is formed between the mounting portion and the opening. Electrical parts characterized by engraving.   The positioning protrusion is provided on the bottom surface of at least a part of the plurality of mounting portions, and the positioning protrusion is inserted into the hole of the printed circuit board. An electrical component wherein the housing is positioned on the printed circuit board.   3. The apparatus according to claim 1, wherein the plurality of placement portions are arranged in a distributed manner on a peripheral edge portion of the outer bottom surface of the housing, and both ends are respectively disposed on side surfaces of the housing at positions adjacent to the placement portions. An electrical component characterized in that the protruding groove portion is arranged so that the region where the mounting portion is located on the outer bottom surface of the housing is partitioned from the remaining region by the corresponding groove portion.   In Claim 3, The said mounting part and the said groove part which were arrange | positioned adjacent to each other become a rising surface where the outer wall surface of the said mounting part on the said groove part side and the inner wall surface of the said groove part are continuous. An electrical component characterized by   5. The electrical component according to claim 3, wherein the groove is formed in an arc shape in a plan view.   The cross-sectional shape of the groove portion according to any one of claims 1 to 5, wherein the mounting portion side rises linearly and the opening side curves in a bulging shape. Features electrical parts.

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